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You can either buy them on BrickLink, or contact LEGO Customer Service directly. BrickLink might be the cheaper of the two options, but if LEGO has them in stock, they are guaranteed to be factory-new.

the best way i found out till now is to get them of as good as possible with your nails or a plastic-knife (i wouldn't recommend to use metal knifes or razorblades - if you do, be careful to avoid scratching the bricks surface) and then remove the remaining glue with:
pure alcohol or
glass cleaner
cheap hairspay (spray 2-3 seconds from very close distance ...

For older sets, you can buy replicas made by some Dutch fans. I've met them on a few occasions and have seen the stickers they make and quite frankly, the quality is excellent. As far as I can see they don't do Technic sets yet, but it can't hurt to ask.
Granted, they are not genuine, but for genuine LEGO sticker sheets you'll usually end up paying a ...

Think about what causes the stickers to deteriorate:
Heat loosens the bonds in the glue, which results in stickers pealing.
Exposure to natural light will cause the colours in the stickers to
fade over time. Unlike LEGO bricks, stickers fade faster under natural light.
With those points in mind, keep stickers in a cool, dry, place away from sunlight ...

For a rectangular sticker on a rectangular surface, I usually try to center it between two sides and align it along the top. This does cause the problem of centering the sticker up and down.
If I really care about the proper alignment, I use the end of a small knife blade to place the stickers properly. Just stick a corner of the sticker to the tip of ...

I performed my own experiments to determine which methods work by randomly applying three stickers (which are similar to the stickers that come in LEGO sets) onto a simple brick wall.
Using my finger nails to peel the stickers worked well. This is how I've always removed stickers and in my experience, I haven't had any problems doing so.
Heating the ...

Another option may to be store them inbetween the pages of a heavy book. This would have the advantage of keeping them flat, as well as cool and dry. The book would need to be kept dry as well, as if the pages got damp they could stick together and make it impossible to get the stickers out.
The downside is that you'll need to remember which book it's ...

Best to remove as much as you can by mechanical means (plastic spatula/fingernail, nothing harder unless you like scratching your bricks) then use some 'Sticky Stuff Remover' to get the sticky residue off.
This stuff works on just about anything without leaving a mark, Lego is made from ABS and will not be affected by it.

If the set is a recent release you can call LEGO's customer service and they will send you a replacement. If it is an older, discontinued set, you can find replacement stickers on BrickLink. Here are all the stickers listed: http://www.bricklink.com/catalogList.asp?catType=P&catString=160

At office/stationary stores such as Office Max or Staples you can get printer friendly sticker paper. The 'AVERY STICKER PROJECT PAPER' comes in clear or white. You can shop around for different finishes. Some are more paper like and other are more like plastic.
From experience this is only good for flat surfaces. To ensure maximum adherence, I recommend ...

Oh, those look sad! Stickers with white designs on them are notorious for peeling/cracking.
I have found that the best way to protect stickers like these is to apply a thin layer of clearcoat to them while they are still new. Wait until the clearcoat dries, then apply the sticker to the LEGO set. You can use pretty much any acrylic clearcoat, medium or ...

You might try and post a request on the ALPS Decal Yahoo group. This is an e-mail group that discusses making water slide decals using the ALPS printer. There are members of the group that do have businesses that produce decals. I don't know how much people charge for custom decal sheets. You'll have to ask.
http://groups.yahoo.com/group/alpsdecal/
...

LEGO Customer Service will be probably be happy to help you out. They've been happy to replace missing or broken parts for me in the past. They have an online service for requesting replacement parts here:
https://service.lego.com/replacementparts
I don't think sticker sheets are listed in the inventories on that page though, so you'll have to add it ...

One important point that the previous answer omits: With the typical "water slide" decal paper, after printing your pattern, generally with an ink-jet printer to get the colors you want, you must waterproof the pattern by spraying several coats of Krylon clear enamel or equivalent and allow it to thoroughly dry before cutting out and trimming the decal and ...

If you don't care about preserving the old sticker, remove it with your fingers or a plastic knife and then use rubbing alcohol to remove the remaining sticky bits. As other posters have noted, metal knives/razors leave the risk of scratching the plastic bricks - it all depends on the level of confidence in your knife/razor skills.
I use alcohol instead of ...

Since the set is still being produced, you can call Lego Customer Service at 1-800-835-4386, and they will most likely be able to help you.
Failing that, the BrickLink website is a popular place to buy replacement parts. Here's the link for the sticker sheet:
http://www.bricklink.com/search.asp?itemID=102237
It looks like there are a handful of sellers in ...

Unfortunately older stickers are difficult to remove and reapply because the sticky part of the paper tend to rip off and leave a residue on the LEGO element itself. But the fact of the matter is that applying that taking off and re-applying even a new sticker is a challenge and it will almost always be visibly damaged at least a little bit.
Your best bet ...

For long-retired products, it may be possible to find scanned images of the stickers online.
Then use a high quality color printer to print new decals which you glue to the bricks.
The result is not perfect, but often good enough to fool an untrained eye.

There is/was a product called Un-Du that would soften the adhesive of stickers so that they could be removed and reused. I was able to find a few links online, so I guess it's still around. The "patented" part of the "Un-Du" product was the tool extension attached to the bottle. The important part is the liquid and that is plain heptane. I haven't ...

Acetone (fingernail polish remover) works quite well also, I used to use it to get rid of marker and stickers on my LEGO bricks as a kid. Definitely do not soak your bricks in it though or you will notice your brick will turn out quite rubbery when you remove it! I found that out the hard way.